FTP on ispconfig 3

I need a little help
i just want to give access to a user to a folder to share some files
using proftpd
If i try to add a user in ispconfig and set the directory to /home/user
i get the error
Response: 500 ?
Error: Failed to retrieve directory listing
do you know why ?

and the user is "defaultuser" not just user but this is less important.